1 files changed, 0 insertions, 372 deletions

diff --git a/src/xdiff/xhistogram.c b/src/xdiff/xhistogram.c
deleted file mode 100644
index 00bbfcec4..000000000
--- a/src/xdiff/xhistogram.c
+++ /dev/null
@@ -1,372 +0,0 @@
-/*
- * Copyright (C) 2010, Google Inc.
- * and other copyright owners as documented in JGit's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- *   notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- *   copyright notice, this list of conditions and the following
- *   disclaimer in the documentation and/or other materials provided
- *   with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- *   names of its contributors may be used to endorse or promote
- *   products derived from this software without specific prior
- *   written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "xinclude.h"
-#include "xtypes.h"
-#include "xdiff.h"
-
-#define MAX_PTR	UINT_MAX
-#define MAX_CNT	UINT_MAX
-
-#define LINE_END(n) (line##n + count##n - 1)
-#define LINE_END_PTR(n) (*line##n + *count##n - 1)
-
-struct histindex {
-	struct record {
-		unsigned int ptr, cnt;
-		struct record *next;
-	} **records, /* an occurrence */
-	  **line_map; /* map of line to record chain */
-	chastore_t rcha;
-	unsigned int *next_ptrs;
-	unsigned int table_bits,
-		     records_size,
-		     line_map_size;
-
-	unsigned int max_chain_length,
-		     key_shift,
-		     ptr_shift;
-
-	unsigned int cnt,
-		     has_common;
-
-	xdfenv_t *env;
-	xpparam_t const *xpp;
-};
-
-struct region {
-	unsigned int begin1, end1;
-	unsigned int begin2, end2;
-};
-
-#define LINE_MAP(i, a) (i->line_map[(a) - i->ptr_shift])
-
-#define NEXT_PTR(index, ptr) \
-	(index->next_ptrs[(ptr) - index->ptr_shift])
-
-#define CNT(index, ptr) \
-	((LINE_MAP(index, ptr))->cnt)
-
-#define REC(env, s, l) \
-	(env->xdf##s.recs[l - 1])
-
-static int cmp_recs(xpparam_t const *xpp,
-	xrecord_t *r1, xrecord_t *r2)
-{
-	return r1->ha == r2->ha &&
-		xdl_recmatch(r1->ptr, r1->size, r2->ptr, r2->size,
-			    xpp->flags);
-}
-
-#define CMP_ENV(xpp, env, s1, l1, s2, l2) \
-	(cmp_recs(xpp, REC(env, s1, l1), REC(env, s2, l2)))
-
-#define CMP(i, s1, l1, s2, l2) \
-	(cmp_recs(i->xpp, REC(i->env, s1, l1), REC(i->env, s2, l2)))
-
-#define TABLE_HASH(index, side, line) \
-	XDL_HASHLONG((REC(index->env, side, line))->ha, index->table_bits)
-
-static int scanA(struct histindex *index, unsigned int line1, unsigned int count1)
-{
-	unsigned int ptr;
-	unsigned int tbl_idx;
-	unsigned int chain_len;
-	struct record **rec_chain, *rec;
-
-	for (ptr = LINE_END(1); line1 <= ptr; ptr--) {
-		tbl_idx = TABLE_HASH(index, 1, ptr);
-		rec_chain = index->records + tbl_idx;
-		rec = *rec_chain;
-
-		chain_len = 0;
-		while (rec) {
-			if (CMP(index, 1, rec->ptr, 1, ptr)) {
-				/*
-				 * ptr is identical to another element. Insert
-				 * it onto the front of the existing element
-				 * chain.
-				 */
-				NEXT_PTR(index, ptr) = rec->ptr;
-				rec->ptr = ptr;
-				/* cap rec->cnt at MAX_CNT */
-				rec->cnt = XDL_MIN(MAX_CNT, rec->cnt + 1);
-				LINE_MAP(index, ptr) = rec;
-				goto continue_scan;
-			}
-
-			rec = rec->next;
-			chain_len++;
-		}
-
-		if (chain_len == index->max_chain_length)
-			return -1;
-
-		/*
-		 * This is the first time we have ever seen this particular
-		 * element in the sequence. Construct a new chain for it.
-		 */
-		if (!(rec = xdl_cha_alloc(&index->rcha)))
-			return -1;
-		rec->ptr = ptr;
-		rec->cnt = 1;
-		rec->next = *rec_chain;
-		*rec_chain = rec;
-		LINE_MAP(index, ptr) = rec;
-
-continue_scan:
-		; /* no op */
-	}
-
-	return 0;
-}
-
-static int try_lcs(
-	struct histindex *index, struct region *lcs, unsigned int b_ptr,
-	unsigned int line1, unsigned int count1,
-	unsigned int line2, unsigned int count2)
-{
-	unsigned int b_next = b_ptr + 1;
-	struct record *rec = index->records[TABLE_HASH(index, 2, b_ptr)];
-	unsigned int as, ae, bs, be, np, rc;
-	int should_break;
-
-	for (; rec; rec = rec->next) {
-		if (rec->cnt > index->cnt) {
-			if (!index->has_common)
-				index->has_common = CMP(index, 1, rec->ptr, 2, b_ptr);
-			continue;
-		}
-
-		as = rec->ptr;
-		if (!CMP(index, 1, as, 2, b_ptr))
-			continue;
-
-		index->has_common = 1;
-		for (;;) {
-			should_break = 0;
-			np = NEXT_PTR(index, as);
-			bs = b_ptr;
-			ae = as;
-			be = bs;
-			rc = rec->cnt;
-
-			while (line1 < as && line2 < bs
-				&& CMP(index, 1, as - 1, 2, bs - 1)) {
-				as--;
-				bs--;
-				if (1 < rc)
-					rc = XDL_MIN(rc, CNT(index, as));
-			}
-			while (ae < LINE_END(1) && be < LINE_END(2)
-				&& CMP(index, 1, ae + 1, 2, be + 1)) {
-				ae++;
-				be++;
-				if (1 < rc)
-					rc = XDL_MIN(rc, CNT(index, ae));
-			}
-
-			if (b_next <= be)
-				b_next = be + 1;
-			if (lcs->end1 - lcs->begin1 < ae - as || rc < index->cnt) {
-				lcs->begin1 = as;
-				lcs->begin2 = bs;
-				lcs->end1 = ae;
-				lcs->end2 = be;
-				index->cnt = rc;
-			}
-
-			if (np == 0)
-				break;
-
-			while (np <= ae) {
-				np = NEXT_PTR(index, np);
-				if (np == 0) {
-					should_break = 1;
-					break;
-				}
-			}
-
-			if (should_break)
-				break;
-
-			as = np;
-		}
-	}
-	return b_next;
-}
-
-static int find_lcs(
-	struct histindex *index, struct region *lcs,
-	unsigned int line1, unsigned int count1,
-	unsigned int line2, unsigned int count2)
-{
-	unsigned int b_ptr;
-
-	if (scanA(index, line1, count1))
-		return -1;
-
-	index->cnt = index->max_chain_length + 1;
-
-	for (b_ptr = line2; b_ptr <= LINE_END(2); )
-		b_ptr = try_lcs(index, lcs, b_ptr, line1, count1, line2, count2);
-
-	return index->has_common && index->max_chain_length < index->cnt;
-}
-
-static int fall_back_to_classic_diff(struct histindex *index,
-		int line1, int count1, int line2, int count2)
-{
-	xpparam_t xpp;
-	xpp.flags = index->xpp->flags & ~XDF_DIFF_ALGORITHM_MASK;
-
-	return xdl_fall_back_diff(index->env, &xpp,
-				  line1, count1, line2, count2);
-}
-
-static int histogram_diff(
-	xpparam_t const *xpp, xdfenv_t *env,
-	unsigned int line1, unsigned int count1,
-	unsigned int line2, unsigned int count2)
-{
-	struct histindex index;
-	struct region lcs;
-	size_t sz;
-	int result = -1;
-
-	if (count1 <= 0 && count2 <= 0)
-		return 0;
-
-	if (LINE_END(1) >= MAX_PTR)
-		return -1;
-
-	if (!count1) {
-		while(count2--)
-			env->xdf2.rchg[line2++ - 1] = 1;
-		return 0;
-	} else if (!count2) {
-		while(count1--)
-			env->xdf1.rchg[line1++ - 1] = 1;
-		return 0;
-	}
-
-	memset(&index, 0, sizeof(index));
-
-	index.env = env;
-	index.xpp = xpp;
-
-	index.records = NULL;
-	index.line_map = NULL;
-	/* in case of early xdl_cha_free() */
-	index.rcha.head = NULL;
-
-	index.table_bits = xdl_hashbits(count1);
-	sz = index.records_size = 1 << index.table_bits;
-	GIT_ERROR_CHECK_ALLOC_MULTIPLY(&sz, sz, sizeof(struct record *));
-
-	if (!(index.records = (struct record **) xdl_malloc(sz)))
-		goto cleanup;
-	memset(index.records, 0, sz);
-
-	sz = index.line_map_size = count1;
-	sz *= sizeof(struct record *);
-	if (!(index.line_map = (struct record **) xdl_malloc(sz)))
-		goto cleanup;
-	memset(index.line_map, 0, sz);
-
-	sz = index.line_map_size;
-	sz *= sizeof(unsigned int);
-	if (!(index.next_ptrs = (unsigned int *) xdl_malloc(sz)))
-		goto cleanup;
-	memset(index.next_ptrs, 0, sz);
-
-	/* lines / 4 + 1 comes from xprepare.c:xdl_prepare_ctx() */
-	if (xdl_cha_init(&index.rcha, sizeof(struct record), count1 / 4 + 1) < 0)
-		goto cleanup;
-
-	index.ptr_shift = line1;
-	index.max_chain_length = 64;
-
-	memset(&lcs, 0, sizeof(lcs));
-	if (find_lcs(&index, &lcs, line1, count1, line2, count2))
-		result = fall_back_to_classic_diff(&index, line1, count1, line2, count2);
-	else {
-		if (lcs.begin1 == 0 && lcs.begin2 == 0) {
-			while (count1--)
-				env->xdf1.rchg[line1++ - 1] = 1;
-			while (count2--)
-				env->xdf2.rchg[line2++ - 1] = 1;
-			result = 0;
-		} else {
-			result = histogram_diff(xpp, env,
-						line1, lcs.begin1 - line1,
-						line2, lcs.begin2 - line2);
-			if (result)
-				goto cleanup;
-			result = histogram_diff(xpp, env,
-						lcs.end1 + 1, LINE_END(1) - lcs.end1,
-						lcs.end2 + 1, LINE_END(2) - lcs.end2);
-			if (result)
-				goto cleanup;
-		}
-	}
-
-cleanup:
-	xdl_free(index.records);
-	xdl_free(index.line_map);
-	xdl_free(index.next_ptrs);
-	xdl_cha_free(&index.rcha);
-
-	return result;
-}
-
-int xdl_do_histogram_diff(mmfile_t *file1, mmfile_t *file2,
-	xpparam_t const *xpp, xdfenv_t *env)
-{
-	if (xdl_prepare_env(file1, file2, xpp, env) < 0)
-		return -1;
-
-	return histogram_diff(xpp, env,
-		env->xdf1.dstart + 1, env->xdf1.dend - env->xdf1.dstart + 1,
-		env->xdf2.dstart + 1, env->xdf2.dend - env->xdf2.dstart + 1);
-}